a big ball of methane and nitrogen that was big ballin' as a planet for about 80 years, until the IAU (International Astronomical Union) decided to get all technical and make that little bitch a "dwarf planet." At this point, it's a pretty safe bet that Pluto won't be getting laid anytime soon.

Pluto used to get invited to P Diddy parties back when he was part of the big 9, but now he can't even kick it with Polly Shore. What a a tool!

1. somebody who has achieved promotion quickly at work, only for it to be obvious that they cannot live up to the job, and hence experience a humiliating demotion
2. a star -rock\pop etc - who is talked about a lot in the press as though they are the next big thing, but then never deliver the goods.
After the planet - which is no longer a planet!

a poor little rock thingy in space that was tricked into thinking it was a planet, when... wham! some mean scientists told it the truth: it was a "dwarf planet" (which is some sick disorder that tiny planets are labeled with). i feel bad for the little guy.